Intraspecific variation in thermal performance curves for early development in Fundulus heteroclitus.

Autor: Blanchard TS; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada., Earhart ML; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada., Shatsky AK; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada., Schulte PM; Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.
Jazyk: angličtina
Zdroj: Journal of experimental zoology. Part A, Ecological and integrative physiology [J Exp Zool A Ecol Integr Physiol] 2024 Oct; Vol. 341 (8), pp. 827-844. Date of Electronic Publication: 2024 May 20.
DOI: 10.1002/jez.2827
Abstrakt: Thermal performance curves (TPCs) provide a framework for understanding the effects of temperature on ectotherm performance and fitness. TPCs are often used to test hypotheses regarding local adaptation to temperature or to develop predictions for how organisms will respond to climate warming. However, for aquatic organisms such as fishes, most TPCs have been estimated for adult life stages, and little is known about the shape of TPCs or the potential for thermal adaptation at sensitive embryonic life stages. To examine how latitudinal gradients shape TPCs at early life stages in fishes, we used two populations of Fundulus heteroclitus that have been shown to exhibit latitudinal variation along the thermal cline as adults. We exposed embryos from both northern and southern populations and their reciprocal crosses to eight different temperatures (15°C, 18°C, 21°C, 24°C, 27°C, 30°C, 33°C, and 36°C) until hatch and examined the effects of developmental temperature on embryonic and larval traits (shape of TPCs, heart rate, and body size). We found that the pure southern embryos had a right-shifted TPC (higher thermal optimum (T opt ) for developmental rate, survival, and embryonic growth rate) whereas pure northern embryos had a vertically shifted TPC (higher maximum performance (P max ) for developmental rate). Differences across larval traits and cross-type were also found, such that northern crosses hatched faster and hatched at a smaller size compared to the pure southern population. Overall, these observed differences in embryonic and larval traits are consistent with patterns of both local adaptation and countergradient variation.
(© 2024 The Author(s). Journal of Experimental Zoology Part A: Ecological and Integrative Physiology published by Wiley Periodicals LLC.)
Databáze: MEDLINE
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